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Ruud's diagnostic ROM
fitted to IBM 5170 (IBM AT), and AT clones


Presently, there is no AT version of Ruud's diagnostic ROM.

If you try to run the XT version of Ruud's diagnostic ROM on an AT-class motherboard, it is expected that certain tests will fail.

The post at here shows me attempting it in 2023.

The test failures are primarily because of hardware differences between a PC/XT-class motherboard and an AT-class motherboard.


( OCT26:  I have an AT version in development.  It is presently at the point where RAM testing is done, but the preceding timer tests need to be implemented before I will release a preliminary version.  Why?  RAM testing can fail de to a faulty timer. )